Texas Instruments ADS7891 Handleiding

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SLAS410 − DECEMBER 2003

 

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FEATURES

D3 MHz Sample Rate, 14-Bit Resolution

DZero Latency

DUnipolar, Pseudo Differential Input, Range:

− 0 V to 2.5 V

DHigh Speed Parallel Interface

D78 dB SNR and 88.5 dB THD at 3 MSPS

DPower Dissipation 85 mW at 3 MSPS

DNap Mode (10 mW Power Dissipation)

DPower Down (10 mW)

DInternal Reference

DInternal Reference Buffer

D8-/14-Bit Bus Transfer

D48-Pin TQFP Package

APPLICATIONS

DOptical Networking (DWDM, MEMS Based

Switching)

DSpectrum Analyzers

DHigh Speed Data Acquisition Systems

DHigh Speed Close-Loop Systems

DTelecommunication

DUltra-Sound Detection

DESCRIPTION

The ADS7891 is a 14-bit 3-MSPS A-to-D converter with 2.5-V internal reference. The device includes a

capacitor based SAR A/D converter with inherent sample and hold. The device offers a 14-bit parallel interface

with an additional byte mode that provides easy interface with 8-bit processors. The device has a

pseudo-differential input stage.

The −IN swing of ±200 mV is useful to compensate for ground voltage mismatch between the ADC and sensor

and also to cancel common-mode noise. With nap mode enabled, the device operates at lower power when

used at lower conversion rates. The device is available in a 48-pin TQFP package.

_

+

SAR

Output

Latches

and

3-State

Drivers

BYTE

14/8-Bit Parallel

Data Output Bus

Conversion

and

Control Logic

CONVST

BUSY

CS

RD

A_PWDPWD/RST

CDAC

Comparator

CLOCK

2.5 V

Internal

Reference

+IN

−IN

REFIN

REFOUT

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

Copyright  2003, Texas Instruments Incorporated

Product specificaties